class Animal:
    def __init__(self, species, sound):
        if species in ['猫', '狗', '羊', '猴子', '老虎', '大象',]:
            self.species = species
            self.sound = sound
        else:
            self.species = None
            self.sound = sound
        def speak(self):
            if self.species == None:
                print('动物园里没有该动物，游戏结束！')
                return  False
            else:
                print(self.species, self.sound)
                return  True
    print('动物园里有什么？')
    flag = True
    while flag:
        s = input('请输入动物种类和叫声 （使用空格隔开）：')
        list1 = s.split('')
        animal = Animal(list1[0], list1[1])
        flag = animal.speak()

